Came upon this thread.
1) 18" wheels do fit. Saw the mention about T Sportlines 18" wheels with the 3mm spacer.
2) Vredestein Quatrac5 are efficient and recommended over OEM Michelins 235/45/18s. See TR's page on them.
3) I'm trying to confirm if spacers were used, would the OEM 18" Aeros clear...